Dinosaurs where land living birdlike reptiles that lived for about 150 million years. Dinosaurs had ther ;egd tucked under them an where most likely warm blooded.What hapend to the dinosaurs: Stegosaurs where whiped out because there sides had no armor an where replaced by ankylosaurs, Igaunodonts evolved into hadrosaurs, an allosaurs evolved in to the biggest carnivores to ever live on land... Giaganotosaurs